replaceCharactersInRange

NSString 替换字符串中某一位置的文字

- (void)viewDidLoad

{

    NSMutableString *a = [[NSMutableString  alloc] initWithString:@"123456798"];

    NSLog(@" \n a:  %@ \n",a);

    [a replaceCharactersInRange:NSMakeRange(1, 4) withString:@"love"];

    NSLog(@" \n a:  %@ \n",a);

    [a release];

}

2011-07-06 09:49:05.523 Q[9513:207]  a:  123456798 

2011-07-06 09:49:05.524 Q[9513:207]    a:  1love6798